Western Snowplows Midweight Series, Mechanic'S Manual

Page: 92 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
92
TROUBLESHOOTING
Safe Handling of the
Printed Circuit Board
Before disassembling the control
and touching the PC board, be
sure to remove any static charge
from yourself. Static charge can
build up as a technician works
on the control.
Best practice is for the technician
to work at a properly grounded
work station and wear a
grounded wrist strap. In place
of a proper work station, the
technician should work in an oil-
and solvent-free area and touch
a good ground each time before
touching the PC board while
servicing the unit.
Handle the PC board by the
edges only. Do not touch the
carbon (black) areas of the
keypad. Skin oils will deteriorate
the contact area.
CAUTION
The circuit board may
be damaged by static
electricity. Always touch
ground before handling
the PC board.
CONTROL/CABLE/PLOW MODULE TEST — Snowplows with FLEET FLEX Electrical System
CONDITION POSSIBLE CAUSE CORRECTIVE ACTION
Control
power light
is not ON.
Snowplow is not connected Make sure grille plugs between snowplow and truck are properly connected.
Incomplete harness
connection(s) or damaged
harness(es)
With the vehicle switched accessory ON, test the 4-pin connector inside the cab.
If pin 1 does not have 12V and/or if pin 4 does not have ground, use the electrical
schematic in this guide to trace the wires from the connector back to their source.
Complete any incomplete connections and repair or replace any damaged wires
and harnesses.
Single-pin connector on
vehicle lighting harness is
not connected
Make sure the single-pin connector on the vehicle lighting harness is properly
connected.
Harnesses connected to
Isolation Module incorrectly
Using the electrical schematic in this guide, verify that the Isolation Module and
harnesses are properly connected.
Control fuse is blown Replace all blown fuses in under-hood electrical harnesses.
Control
power light
is blinking.
Slow flash:
Poor connection, damaged
control or damaged
Plow Module
Make sure all plugs (control, between the snowplow and truck, on the snowplow,
etc.) are properly connected.
If all plugs are properly connected, install a properly working control. If problem is
corrected, replace PC board and/or coiled cord in the damaged control.
If problem is not corrected with a properly working control, replace the Plow Module.
Fast flash:
Snowplow is locked.
Enter a 4-digit security code to unlock the snowplow.
Control
power light
is ON, but
snowplow
does not
respond.
Harnesses connected to
Isolation Module incorrectly
Using the electrical schematic in this guide, verify that the Isolation Module and
harnesses are properly connected.
Blown fuse or damaged
Plow Module
Replace all blown fuses on vehicle and snowplow.
If the fuses are all okay, check for 12V at all coils and primary terminal of motor
relay. If 12V is missing from any coil or relay, replace the Plow Module. If 12V is
present, go to next Possible Cause.
Damaged harness(es) or
cable(s)
Perform a Solenoid Coil Activation Test (SCAT) according to the instructions in
this guide. Replace/repair any damaged harnesses and cables.
Damaged control or
Plow Module
Install a properly working control. If the problem is corrected, replace the PC board
and/or coiled cord in the damaged control.
If problem is not corrected with a properly working control, replace the Plow Module.